I'm at 38 hours. 97% achievements. Only one that's left is the glitched final achievement, for unlocking all other achievements. I'm still having a blast replaying this game even though I have done everything more than once. I don't think I will be truly done with it until they fix that achievement glitch... I want my 100%! I'm still not tired of the game. If doing a map editor for this game were possible, I could seriously see myself dropping over a hundred hours into this.

32 hours, 94% achievements. I have A+ all chapters left, but I am gonna leave one chapter without the A+ until the last bugged achievement is patched. This game is so much fun I couldnt see myself getting bored of it ever!

At 27 hours and 97% achievements done. Starting to get bored and I am not finding the game challenging anymore. I don't want to be bored of it as I love basking in its atmosphere and enjoy the split-second decision gameplay but now I've played all the chapters over and over I can breeze through them. Currently I am trying to artifically introduce more challenge by imposing restrictions such as using the Nigel (Bat) mask, killing only through drilling and trying for speedruns. Luckily creating maps seems to be perfectly possible as some guy made a thread about it and put a video up of his new map.

What I'd love to see is some survival/endless gamemode. One level, enemies constantly enter through extenal doors, weapons respawn periodically. Survive for as long as possible and get the best possible score.

Or a gamemode where instead of playing a level then moving on to the next, the next section entry takes you to a random level selected from all possible levels. The levels that are encountered in this gamemode would have randomly located and spawned enemies (within reason) to keep it fresh and stop the player from being able to predict the entire level.